Having a big hero pool is bad?

Hello everyone) I mainly play duelist, but also can pick vanguard and strategiest, but i think i have too much hero in my pool, ny hero pool from best to worst: Vanguard: Venom, Strange, Thor or Hulk, can't choose. Duelist: Black Panther, Spider Man, Hela, Moon Knight, Winter Soldier, Wolverine Strategiest: Mantis, Adam Warlock

Should i get my pool shorter?